DIY art

I am thinking about painting this weekend...painting some wall art that is. I don't paint on regular basis but my living room walls need some color. I cannot really find anything I like; so I figured I would try something myself. What do you think? 

I have a lot of black, white, gold in my living room. The only real piece of color is my Victorian sofa, which is baby blue. Question is whether I should use the colors I have orrrrr do something completely different and use new fun bright colors. 

Below are some works I found on Pinterest that I like...

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What do you think? Doable? Do you have a Pinterest board with art pieces you like? I would love to see. Please share the link to your Pinterest page in the comment section.